Not all motion-laws have a Segment-Range.
Segment-Range parameters edit the start and end of the mathematical-function that defines the motion-law.
Segment-Range does NOT change the Segment-Width
![]() Start and End Segment Ranges |
Segment Ranges - available with many, but not all, Traditional Motion-Laws. The parameters are:
0 ≤ Start Range < End Range ≤ 1 |
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Notes:
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The images shows the acceleration graph of a Modified Sinusoid motion-law. The X-axis start is 30º and X-axis end is 120º Image 1 Default Segment-Range parameter values.
Segment-Width does not change. |
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Image 2
A Start-Range = 0.2 removes 20% at the start of the Modified-Sinusoid segment mathematically function |
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Image 3
The End-Range = 0.8 removes 20% at the end of the Modified-Sinusoid segment. Segment-Width does not change. |
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see also: Segment Editor: Segment-Width, Segment Editor: Parameters |
Symmetrical Motions The crossover [or vice-versa] is usually at the mid-point of the Segment-Width. Asymmetrical Motions The crossover is not at the mid-point of the Segment Width. When to use Asymmetrical Motions You want the mechanism tool to accelerate quickly from a dwell until it reaches a peak velocity that is sooner than the mid-point of the motion-law, It is then followed with a deceleration that is longer than the standard deceleration duration. Or vice-versa. |
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You can model an asymmetrical motion with two segments that have the same motion law - for example a Modified Sinusoid. Orange Line graph :Symmetrical Mod-Sine Motion-Law : λ = 0.5 This motion-law is usually specified with one standard Mod-Sine segment. However, here, it has two Mod-Sine segments. Segment 1 Machine angle: 0 - 180º [ 0 - 0.5 of total duration] Displacement : 0 - 50 units Segment Ranges = 0 and 0.5. Segment 2 Machine angle: 180 - 360º [ 0.5 - 1.0 of total duration] Displacement : 50- 100 units Segment Ranges = 0.5 and 1. Black Line graphAsymmetrical Mod-Sine Motion-Law : λ = 0.25 Crossover @ 0.25 = 90º machine angle. It also two Mod-Sine segments: Segment 1: Machine angle: 0 - 90º [0 - 0.25 of total duration] Displacement : 0 - 25 units Segment Ranges : 0 and 0.5. Segment 2: Machine angle: 90 - 360º [0.75 - 1.0 of total duration] Displacement : 75 - 100 units Segment Ranges = 0.5 and 1. Characteristics Values of Asymmetrical Motion-Law. Velocity : No Change to Symmetrical Motion-Law. Acceleration: Segment 1 : Cas = Ca / 2λ ; Acceleration: Segment 2 : Cas = Ca / 2(1-λ) |